How out-of-level or out-of-plane does a floor need to be before it is noticeable?
Many of the houses I've lived in have floors that are out-of-level, visible to the naked eye. At what point does that happen?
(I realize that rigid flooring materials like tile need a floor that is in-plane, but that's not my concern here.)
Best Answer
Beauty is in the eye of the beholder. The larger the room, it easier it is to visually pick up on a level problem. I tend to be a bit of a fuss budget, but I can usually pick up on a 10 foot span that is much more than 1/4 to 3/8 inch off level. This is a pretty objective observation that would be more pronounced to a trained eye than a casual observer.